The 2mm T2-T2 ring on the ZWO electronic filter wheel had been over tightened and proved near impossible to remove. Eventually it was loosened but the EFW surface was scratched in the process. A 3D printed part was designed to allow small bolts to line up with the holes on the ring, a screwdriver being used to apply torque. Version 1(red) has the metal bolts slightly misaligned, version 2 (grey), the holes for the bolts were made slightly bigger.
